Florida frost dates: O
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| O Brien | Mar 8 | Nov 25 | 262 d | 9a |
| Oak Hill | Feb 10 | Jan 8 | 332 d | 10a |
| Oakland | Jan 28 | Jan 9 | 346 d | 9b |
| Ocala | Feb 25 | Dec 12 | 290 d | 9a |
| Ochopee | Jan 18 | Jan 16 | 363 d | 10b |
| Ocklawaha | Feb 25 | Dec 12 | 290 d | 9b |
| Ocoee | Jan 28 | Jan 9 | 346 d | 10a |
| Odessa | Jan 20 | Jan 9 | 354 d | 9b |
| Okahumpka | Jan 26 | Jan 9 | 348 d | 9b |
| Okeechobee | Jan 31 | Jan 11 | 345 d | 10a |
| Old Town | Mar 6 | Nov 26 | 265 d | 9a |
| Oldsmar | Jan 20 | Jan 9 | 354 d | 10a |
| Olustee | Mar 1 | Nov 28 | 272 d | 9a |
| Ona | Feb 4 | Jan 8 | 338 d | 9b |
| Oneco | Jan 16 | Jan 11 | 360 d | 10a |
| Opa Locka | rare frost | 11a | ||
| Orange City | Feb 17 | Dec 30 | 316 d | 9b |
| Orange Lake | Mar 1 | Dec 7 | 281 d | 9a |
| Orange Park | Feb 1 | Jan 5 | 338 d | 9b |
| Orange Springs | Mar 1 | Dec 7 | 281 d | 9a |
| Orlando | Jan 17 | Jan 13 | 361 d | 10a |
| Orlando (Brevard) | Jan 24 | Jan 9 | 350 d | 10a |
| Ormond Beach | Feb 3 | Jan 9 | 340 d | 9b |
| Osprey | Jan 25 | Jan 19 | 359 d | 10a |
| Osteen | Jan 24 | Jan 9 | 350 d | 9b |
| Otter Creek | Feb 28 | Dec 2 | 277 d | 9a |
| Oviedo | Jan 24 | Jan 9 | 350 d | 10a |
| Oxford | Jan 26 | Jan 9 | 348 d | 9b |
| Ozona | Jan 20 | Jan 9 | 354 d | 10a |